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I don't think the 4.0 Whipple is mentioned in GM's parts catalog...I think the Cobra Jets with the 5.0 are using a 2.9 Whipple and running low 9's, but it has been mentioned they will be upgrading them to the 4.0 like the earlier examples of the breed...They will definitely be faster than the COPOs with the bigger blower, because the heads will outshine the LS heads.
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